Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cff46b1f70a8520…

MALICIOUS

PDF

119.2 KB Created: 2021-06-21 07:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 57f67e09f5f9bc58a6ba5a937217bdba SHA-1: 773dc32f72cacd67acbdd2f961d2c36d3ae95951 SHA-256: 7cff46b1f70a8520f3599e3d7638addb8cb361e0103aef69671e12aee1493516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories. The document body contains garbled text, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0db9fn751llapautrbj7rgl5f1/4078992689.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/96699c3105d53e9c174f2c163ae42075/xunexex.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/49183173833.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/38311000657.pdfIn PDF document text
    • https://wagaskar.com/media/fexoj.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/12483324850.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608993adb58a2---1288154432.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840c95ede5e---83076609426.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vajugadiwumosuw.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vularetofexez.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/soxuz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b429e238cc9---taxuladigud.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6a2a20992557c6da3357f71acabd8945/pakara.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca77e6a98---14691703048.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/puretet.pdfIn PDF document text
    • http://apvn.info/userfiles/file/luxuwaro.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/80205487350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=naruto+season+10+englishPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 34260 bytes
SHA-256: 02a6015ec7e96625b93caff294baa33cfc283b74b838395ef59bac380b6114e5
font_01_sfnt_off000198ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198BA 5112 bytes
SHA-256: cef4585b33058ed090ae7684fc85a40289ad3c547143524a02dfd687eaa1413d
font_02_sfnt_off0001aa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA1D 11040 bytes
SHA-256: 94eea415e5a746d23a188f1a9df645ba5708424958fd8a0cf3500979d2ad7240